What is a nice word to describe somebody that starts with U?

The Word "You" followed by any playfully uttered obscenity of your choosing, or alternatively, if you are aiming to describe a soon-to-be-former friend, one of equal or greater value in a thoroughly less playful tone.

Sprinkle with salty adverbs and garnish with indignation.

Examples:

(in order of increasing severity)

You magnificent %@$!#^&!

You miserable %$#*ing &@%%*#!

You spousally-consanguineous swamp cretin!

You #$@-guzzling gutter-&^#$!